Detailed Activity in Allowance for Possible Loan Losses by Portfolio Segment (Detail) (USD $)	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 6,681,412	$ 6,379,070
Provision for possible loan losses	1,328,461	2,586,707
Chargeoffs	767,014	1,658,080
Recoveries	206,573	96,721
Net Chargeoffs	560,441
Ending Balance	7,449,432	7,404,418
Loans individually evaluated for impairment	1,744,187
Loans collectively evaluated for impairment	5,705,245
Loans, allowance for loan losses	7,449,432	7,404,418
Real Estate Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	4,176,475
Provision for possible loan losses	1,204,314
Chargeoffs	511,610
Recoveries	49,440
Net Chargeoffs	462,170
Ending Balance	4,918,619
Loans individually evaluated for impairment	1,686,862
Loans collectively evaluated for impairment	3,231,757
Loans, allowance for loan losses	4,918,619
Business Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,672,467
Provision for possible loan losses	15,456
Chargeoffs	55,260
Recoveries	50,332
Net Chargeoffs	4,928
Ending Balance	1,682,995
Loans individually evaluated for impairment	57,325
Loans collectively evaluated for impairment	1,625,670
Loans, allowance for loan losses	1,682,995
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	832,470
Provision for possible loan losses	108,691
Chargeoffs	200,144
Recoveries	106,801
Net Chargeoffs	93,343
Ending Balance	847,818
Loans collectively evaluated for impairment	847,818
Loans, allowance for loan losses	$ 847,818

Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.

+ References+ Details

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References+ Details

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details